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-rw-r--r--clang/lib/Basic/CLWarnings.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/clang/lib/Basic/CLWarnings.cpp b/clang/lib/Basic/CLWarnings.cpp
index 0cf367d9f7f6..5449d8f59fcf 100644
--- a/clang/lib/Basic/CLWarnings.cpp
+++ b/clang/lib/Basic/CLWarnings.cpp
@@ -12,10 +12,11 @@
#include "clang/Basic/CLWarnings.h"
#include "clang/Basic/DiagnosticCategories.h"
+#include <optional>
using namespace clang;
-llvm::Optional<diag::Group>
+std::optional<diag::Group>
clang::diagGroupFromCLWarningID(unsigned CLWarningID) {
switch (CLWarningID) {
case 4005: return diag::Group::MacroRedefined;